<template>
  <Demo @hello="showHelloMsg" msg="你好啊" school="金九">
    <!-- <span>蓝天</span> -->
    <template v-slot:xuexiao>
      <span>蓝天</span>
    </template>
  </Demo>
</template>

<script>
import Demo from './components/demo.vue'
export default {
  name: 'App',
  components: {
    Demo
  },
  setup() {
    function showHelloMsg(value) {
      alert(`你好啊,你触发了hello事件,我收到的参数是${value}`)
    }
    return { showHelloMsg }
  }
}
</script>
